Features:*Made of superb material, and practical to use*【Easy to Install】No groove required for door. No holes drilled within the floor. It doesn't take a lot time to install.*【Application】This instruction manual wheel is dedicated to automatic doors, sliding doors, framed doors, wood doors, metallic doors. Meet all your needs.*【Excellent Design】The silver outdoors design meets maximum decorative styles, both beautiful and practical. It matches beautifully with every kind of doors.Specifications:Material:SteelSmall size of 7.5*3.5CMLarge size of 10*4CMPackage Contents:1*Door Floor GuideNote:1. The real colour of the article may be barely various from the pictures shown on web content attributable to many points corresponding to brightness of your computer screen and light brightness.2. Please allow slight guide size deviation for the data.