This Bosch ROBUSTLine HSS-G drill bit set is designed to give very clean accurate holes in wood and metal but they will also cut cleanly in plastic and acrylics, sold as a set of 10 these precision ground HSS-G drill bits enable up to 40% faster drilling rates and 50% lower feed pressure than standard ground HSS bits, with a chisel edge and split point drill tip manufactured to DIN338, a very high quality set all contained in a Bosch Robust Line case for durability and ease of use. Sizes contained 1 -10mm in 1mm steps.