Original Bosch 2606309942 — Gear Assembly / Transmission for select Bosch percussion drills. This genuine Bosch replacement transmission includes the precision-machined metal gear set and housing that rebuilds the drill’s gearbox and percussion drive for reliable, smooth engagement under load.

Direct-fit for Bosch GSB 21‑2 RE and GSB 24‑2 series percussion drills (appears under Bosch part listings for these models and related model numbers).

Bosch part number 2606309942 (UPC 000346561418) — sold as a single complete gear assembly to replace worn or damaged transmissions and keep your tools operating like new. Ideal when stocking essential power tool parts for maintenance or repair.