Description: This drill guide is mainly made of premium plastic and bearings, sturdy and durable in use. It is easy to use and with sucker base to fix itself at surface of ceramic tile. 4mm to 83mm adjustable clamping range allows you to drill different size holes on the surface of ceramic tile, glass or marble. Features: Premium thickened engineering plastic is wear resistant and long lasting. Adopting high quality closed bearings, high strength and long durability. Rubber sucker base can easily attach to the smooth surface, with strong holding force, so the drill guide won't move away making your operation smooth. The clamping range is adjustable from 4mm to 83mm to drill holes of different sizes. Easy to use, can be used to drill holes on the surface of ceramic tile, glass or marble. Specifications: Condition: 100% Brand New Material: Metal + Plastic Color: Green Clamping Range: 4-83mm(Adjustable) Total Size: approx. 13.5*26.6cm / 5.31*10.47in Contracted Size: 14.3*18.5cm / 5.63*7.28in Weight: approx. 383g Package Included: 1 x Glass Drill Guide