Material: Heavy carbon steel body and plastic roller make gliding smooth and quiet PARAMETERS: L: 9cm; W: 3cm; G: 6cm; Roller wheel diameter: 3.5cm, suitable door thickness from 2.5cm to 5cm Advantage: No need for a groove for the door, no holes to drill in the floor Packing: 2PCS Adjusatble Floor Guide for double door (1 door nees 1PC) LIFETIME WARRANTY: 100% Money Back Guarantee, Step-by-Step Instructions and Experienced Customer Service Team We will do our best to help you EASY INSTALLATION 1.Place the guide on the floor against the wall; 2. Draw the drilling position and drill the hole, put in the green accessories; 3. Put on the small wheel first, then adjust the distance between the two wheels according to the thickness of the door. 4.Tighten the screws. Product Details 2PC Floor Guide for Sliding Wooden Door Hardware The color black Size: 3.66"*1.18"*2.36" (9.3cm*3cm*6cm) Wheel diameter is 1.45" (3.7cm) Suitable door thickness: 0.98" - 2" (2.5cm-5cm)