Perfectly equipped for a wide range of applications. 37-piece set with flexible adapters and versatile extensions for a variety of fastening and assembly tasks. Any combination of tools, hexagon tool receptions and 1/4 inch square tool inserts can be used in the Centrotec adapter. ¼ inch socket set from 4 to 13 mm. 19 different bit inserts and 2 bit extensions. Ratchet and Centrotec handle plus various adapters and extensions.