material: High quality steel, heat treatment process, high hardness and toughness. Shims are made of high hardness stainless steel, heat treated process to improve toughness. Multiple Uses: Using this hand stone splitting tool, suitable for splitting hard stone, rock, , marble, concrete, basalt, sandstone, gneiss, limestone, shale, conglomerate. 18mm Rock splitter should be used with holes of 18mm in diameter and 50mm deep. How to use: Drill holes with dedicated hollow drill, remove the dust residue of the hole; Put stone splitter in the holes; Hit splitter with a hammer until the stone cracks. Product Length: 105mm Hole depth: 50mm Product weight: 146g (18mm) Attention: Please take the necessary protective measures before using; When the stone is about to split, keep alert. Colour: as shown Material: Chrome vanadium alloy steel Package Contents: 10 x Stone splitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.