Bosch OSCS23 23-Piece Oscillating Tool Multi-X Accessory Set Features award-winning pro interface Oscillating Interface System (OIS) Bosch OIS provides secure connection between multi-tool and accessory for high-torque appliations Direct compatibility with OIS tools such as Bosch, SKIL, Rigid, Milwaukee and Fein 636 Fits most multi-tools with OIS adapter Includes 23-pieces in set