Features: Each carbide drill door frame screw is finely ground to fit a certain tolerance to ensure the correct hole diameter and achieve maximum thread holding force. Flat on the shank fits all drill adapters. The drill bit is specially cut off to make it very durable. Suitable for drilling holes in masonry, cement, ceramic tile, brick, block, rock, stone, concrete, metal, plastic, wood, etc. Specification:Material: Carbon Steel Drill Bit Diameter: 4mm, 5mm, 6mm, 8mm, 10mm Drill Bit Length: 74mm, 85mm, 100mm, 118mm, 119mm Color: Gray Quantity: 1 PcNote:1. Please allow 0-1cm error due to manual measurement. Pls make sure you do not mind before bidding.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1 x Tungsten Carbide Drill Bit