General description Hand Tool: Used to split hard stone, rock, marble, and concrete. This tool set includes 10 plug wedges and shims designed for effective splitting. Technical specifications Diameter: 5/8 inch (16mm) Material: Metal Color: Black Measurement allowed error: +/- 1-3cm Installation First, use a quarrying dedicated drill to create holes and remove residual powder from the hole. Next, place the larger side of the two wedges (flat to flat) into the hole. Then, insert the smaller side of the central wedge between the two wedges. Finally, use a hammer to split the stone. Usage Ensure necessary protective measures are taken before use. Stay alert when the stone is about to split. Other information Packing List: 10 x Set Wedge Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product.