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5pcs magnetic screwdriver s2 alloy steel double-headed cross drill bit set. item details: 100% brand new and high quality. it is made of high-strength s2 chrome-plated alloy steel and is extremely durable. suitable for installation in pneumatic screwdrivers, electric screwdrivers, rechargeable electric drills, and wind bits.

Dth drill bit, drilling tool, drill bit manufacturer / supplier in china, offering hjg high performance 6 inch rock drill dth hammer, cemented carbide for mining, crawler hydraulic well-geothermal drilling rig hjg-w828a and so on.

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The optimum range of hole size for dth drilling is 90 mm (3.5”) to 254 mm (10”). smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. as a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”).

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