diff --git a/src/Attribute.php b/src/Attribute.php
index ebd7a11..c3626a1 100644
--- a/src/Attribute.php
+++ b/src/Attribute.php
@@ -47,8 +47,10 @@ public function __construct(
         $this->validation = $validation;
         $this->alias = $alias;
         $this->key = $key;
+        $rule_number = 0;
         foreach ($rules as $rule) {
-            $this->addRule($rule);
+            $this->addRule($rule, $rule_number);
+            $rule_number++;
         }
     }
 
@@ -125,11 +127,11 @@ public function getOtherAttributes(): array
      * @param \Rakit\Validation\Rule $rule
      * @return void
      */
-    public function addRule(Rule $rule)
+    public function addRule(Rule $rule, int $rule_number)
     {
         $rule->setAttribute($this);
         $rule->setValidation($this->validation);
-        $this->rules[$rule->getKey()] = $rule;
+        $this->rules[$rule->getKey() . (string)$rule_number] = $rule;
     }
 
     /**
diff --git a/src/Rules/Length.php b/src/Rules/Length.php
new file mode 100644
index 0000000..ebe3457
--- /dev/null
+++ b/src/Rules/Length.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Rule;
+
+class Length extends Rule
+{
+    use Traits\SizeTrait;
+
+    /** @var string */
+    protected $message = "The :attribute must must have an exact length of :length";
+
+    /** @var array */
+    protected $fillableParams = ['length'];
+
+    /**
+     * Check the $value is valid
+     *
+     * @param mixed $value
+     * @return bool
+     */
+    public function check($value): bool
+    {
+        $this->requireParameters($this->fillableParams);
+
+        $length = (int) $this->parameter('length');
+
+        return strlen((string) $value) == $length;
+    }
+}
diff --git a/src/Rules/LengthIn.php b/src/Rules/LengthIn.php
new file mode 100644
index 0000000..ad30131
--- /dev/null
+++ b/src/Rules/LengthIn.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Helper;
+use Rakit\Validation\Rule;
+/**
+* Check if attribute has length in allowed values
+*
+*
+*/
+class LengthIn extends Rule
+{
+
+    /** @var string */
+    protected $message = "The :attribute must have length only :allowed_values";
+
+    /** @var bool */
+    protected $strict = false;
+
+    /**
+     * Given $params and assign the $this->params
+     *
+     * @param array $params
+     * @return self
+     */
+    public function fillParameters(array $params): Rule
+    {
+        if (count($params) == 1 && is_array($params[0])) {
+            $params = $params[0];
+        }
+        $this->params['allowed_values'] = $params;
+        return $this;
+    }
+
+    /**
+     * Set strict value
+     *
+     * @param bool $strict
+     * @return void
+     */
+    public function strict(bool $strict = true)
+    {
+        $this->strict = $strict;
+    }
+
+    /**
+     * Check $value is existed
+     *
+     * @param mixed $value
+     * @return bool
+     */
+    public function check($value): bool
+    {
+        $this->requireParameters(['allowed_values']);
+
+        $allowedValues = $this->parameter('allowed_values');
+
+        return in_array( strlen((string)$value), $allowedValues, $this->strict);
+    }
+}
diff --git a/src/Validator.php b/src/Validator.php
index dfa19c5..0a87d01 100644
--- a/src/Validator.php
+++ b/src/Validator.php
@@ -162,6 +162,8 @@ protected function registerBaseValidators()
             'defaults'                  => new Rules\Defaults,
             'default'                   => new Rules\Defaults, // alias of defaults
             'nullable'                  => new Rules\Nullable,
+            'length'                    => new Rules\Length,
+            'length_in'                 => new Rules\LengthIn,
         ];
 
         foreach ($baseValidator as $key => $validator) {