Item Type: Carborundum Drill Bit Material: Carborundum, alloy Shank Diameter: Approx. 2.35mm / 0.09in, 3mm / 0.12in Product Length: Approx. 45mm / 1.8in Applicable Machine: Pneumatic grinder, electric grinder, hanging grinder, etc. that can hold 2.35mm/3.0mm shank diameter Purpose: Mold processing and repair, glass polishing, cleaning flash, burr, weld of cast and forged weldments, inner hole surface of various mechanical parts, etc. 1Made of full good-quality carborundum, finely polished and exquisitely carved, bring hard texture 2The handle is made of high-hardness alloy material, which is more wear-resistant and durable 3This mixing set contain a variety of specifications, which are applicable to meet the needs of use 4Suitable for pneumatic grinder, electric grinder, crane grinder, etc., very practical 5Used for mold processing and repair, glass grinding, cleaning flash, burr, weld of cast and forged weldments, inner hole surface of various mechanical parts, etc. 30 x Carborundum Drill Bit 1 x Storage Box