Durable 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, granite, 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 the rock 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: 5 * 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.