This 0.5-3mm Small Electric Drill Chuck Set for RS-775 Motor consists of 5 drill collets of size 0.5mm, 1mm, 1,5mm, 2.3mm, 3mm. This is Compatible with most rotary tools used in hardware, hobby, home, etc. This 0.5-3mm twist drill chuck set is made of brass with excellent workmanship. The chalets can go with a twist drill as a mini hand drill ABS board, aluminium sheet, paperboard drilling. This can be used with sheet iron, aluminium, copper, plastic, etc. This is a good quality drill chuck set.