... *Measuring materials: steel and cast steel, cold work tool steel, stainless steel,grey cast iron, nodular cast ... allorys,brass(coppper-zinc alloys), bronze(copper-alluminium alloys/copper-tin alloys),wrought copper alloys *Hardness scales: HL,HB, ... 4piecesOptional Accessories:* Cleaning brush 1piece * Impact devices 6pieces * Tool for install imapct ball 1piece * Support ring 1piece * Imapct ball ...