Small Tough Case System Set Connectable Case allows multiple sets to be stacked and locked together. TSTAK compatible to hold all your accessory sets in one place. - Compatible with the TSTAK system via the Caddy and Large Tough Case - Easy bit removal and retention for user convenience - Bits lock into place to prevent them falling out when not in use - Optimised Tip Geometry for full fitment in the fastener and reduced cam-out - Full-fit head eliminates wobble and screw head rounding - Includes a drive guide with an extending sleeve for improved fastener stability and control - Includes nut drivers