... : K30 1. Hard metal / hard alloy, tungsten carbide Specification:2. Hard metal / hard alloy, Carbide Tipstype Grade:K10,K20,K303. Performance: A) ... hard metal / carbide They are used in geological prospecting, machinery and tool manufacturing, and Serves as the drill bits in ... used in nonstop cutting of cast irons, its Alloy and nonmetal materials. Semi-precision lathes, precision lathes, small- ...