Features:*Made of advantageous material, and practical to use*【Easy to Install】No groove required for door. No holes drilled in the floor. It doesn't take a lot time to install.*【Application】This instruction manual wheel is devoted to automated doors, sliding doors, framed doors, wood doors, metallic doors. Meet all of your needs.*【Excellent Design】The silver outside design meets maximum decorative styles, both beautiful and practical. It matches superbly with all kinds of doors.Specifications:Material:SteelSmall length of 7.5*3.5CMLarge size of 10*4CMPackage Contents:1*Door Floor GuideNote:1. The genuine colour of the item may be slightly various from the pictures proven on web content attributable to many factors comparable to brightness of your visual display unit and light brightness.2. Please allow slight manual size deviation for the data.