Description: 【Durable】:Dry diamond core drill bit made of brazing process and sintering process, high temperature resistance, high hardness, stronger and more durable 【Design】: Hexagonal shank anti skid design, built in solid lubricating , can gradually melt into water during drilling, thus effectively reducing the temperature, lubricating and protecting the drill bit, reducing high temperature burnout and increasing the use frequency and life of the product, Dry, wet drilling,very convenient 【Application】:1/4 inch diamond saw core drill bit is widely used for glass/ceramic/marble/concrete/vitrified tile, microcrystalline stone/granite/ stone/full tile, etc. 【Matching】: hex shank  fits into conventional electric hand drill/lithium electric drill/bench drill/drill (angle grinder and electric hammer impact drill need to change the chuck to use) 【Tips】:Diamond Drill Bit Set Very high efficiency, multi purpose drilling, Long life drilling, Drilling tips: high speed / slow shaking / fast drilling  Specification: Shank: 1/4 Inch Hex Shank  Hole diameter: 6mm Hole depth: ≤35mm Overall length: 67mm Hole diameter: 8mm Hole depth: ≤42mm Overall length: 80mm Hole diameter: 10mm Hole depth: ≤40mm Overall length: 80mm Hole diameter: 12mm Hole depth: ≤40mm Overall length: 80mm Hole diameter: 14mm Hole depth: ≤42mm Overall length: 80mm Hole diameter: 16mm Hole depth: ≤42mm Overall length: 80mm Package Includes: 1 Drill Bit(4 Pack) Note: 1. The angle grinder needs to be equipped with a conversion chuck. 2. The faster rotation speed, the more the number of punching holes, the recommended rotation speed is above 2600mpr/m. 3. It is not recommended to use ordinary impact drills.