The chisels in this kit are designed to be used with the arbortech power chisel. arbortech chisels are manufactured using high strength carbon steel & tempered to provide hours of woodworking fun. Each chisel is hand sharpened & honed & ready-to-use!. 3 x 20mm gouge. 5 x 12mm gouge. 9 x 13mm gouge. 11 x 7mm gouge. 60mm x 8mm v-tool.