RA Burs | Latch-Type Contra-Angle

Busch’s latch-type (RA) instruments for slow-speed contra-angle handpieces: excavating round burs — including the low-vibration 1SX and slim-neck 1SXM cuts — plus finishers, prophy instruments, and polishers.

RA is the excavation and finishing shank: lower speeds, higher torque, tactile control. The 2.35 mm latch shank seats positively for confident slow-speed work.

FAQ

What does RA mean on a bur? Right angle — a 2.35 mm shank with a latch groove for slow-speed contra-angle handpieces. Busch’s German designation is W (Winkelstück).

What are RA burs used for? Caries excavation at low speed, finishing, prophylaxis, and polishing — anywhere torque and tactile feedback beat raw speed.

Where are these burs made? Every instrument in this collection is manufactured by Busch & Co. in Engelskirchen, Germany — an ISO 13485-certified specialist in rotary precision instruments since 1905 — and ships fast from our US warehouse.

Reference resources: Bur Comparison Chart · Speed Chart · Color Coding & ISO Guide · Glossary

Further reading: FG vs. RA Shanks Explained: Choosing the Right Bur Shank for High-Speed and Slow