1. Central wedge + 2 wedges composition. 1. First using quarrying dedicated drill holes, remove residual powder of hole. 2. Next upside down the big side of 2 wedges (flat to flat),and put it into hole. 3. Then upside down the small side of central wedge between 2 wedges , and finally using the hammer split stone. Suitable For: Split the hard stone,rock,,concrete Colour: black Material: metal Size: diameter 16mm, length 125mm Package Contents: 6 x Stone separator Note: Before use, please make the necessary protective measures When the stone is about to split, keep alert. Only the above package content, other products are not included. Note: Light 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.