Synthes 338.49 Quick Coupling Drill Attachment Orthopedic 1.5mm Swiss F/Small 3-1/8" #2 

• Model: 338.49
• Shaft Diameter: 1.5mm
• Overall Length: 3-1/8 inches

The 338.49 Quick Coupling Drill Attachment is a modular interface component used in Synthes (and compatible) surgical drill systems. Its role is to allow a “small air drill” — which typically has pneumatic drive rather than electric or battery — to change drill bits quickly and securely via the quick‑coupling mechanism. That saves time in the OR, facilitates efficient workflow, and reduces the need for multiple different chucking tools or thread‑on attachments. Since small air drills are often used in orthopedic, trauma, or implant removal/placement tasks, having a large quick coupling helps accommodate different bit sizes or styles while maintaining compatibility and secure engagement.

Because it’s termed “large” coupling for a small air drill, this suggests the coupling body is made to handle somewhat more robust torque or to accept bigger bit shank diameters than micro bits, while still being compatible with the smaller / delicate drill bodies. The quick coupling also has to ensure solid alignment, minimal run‑out, and good retention force so that the bit does not loosen during drilling. Given that this is an air drill coupling, it likely has standardized mating surfaces, locking mechanisms (e.g., a push‑in and twist‑or‑snap locking ring, or collar) to prevent inadvertent detachment under load or vibration.

In practical usage, this attachment is particularly useful when multiple drill bit swaps are needed — for example switching from pilot drill to larger drill, or from drilling to tapping or reaming. It reduces downtime compared to threaded chucks. That said, there are trade‑offs: quick couplings tend to have more moving parts (which can wear), require excellent cleaning / sterilization to avoid debris getting into the coupling mechanism, and must be inspected regularly for wear or damage. Also, coupling “large” size means potentially more clearance needed in tight surgical fields; the bit‑shank engagement must be precise so that torque transfer is accurate, avoiding bit wobble which could lead to off‑axis drilling or screw misplacement.

This item is used and in excellent condition.