Hand Tool: Used to split the hard stone,rock,,marble,concrete Diameter 5/8 inch (16mm) ,(Use 1/2 inch hammer bits can be) Size: Please refer to picture heat treatment process, High hardness, toughness; Colour: Black material: metal How to use 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 Packing List: 40 x Set Wedge and 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 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.