Check the listing for details. Matco Tools RL301 - Straight 1/4" Capacity Die Grinder.. Condition: For parts or not working. Listed at 22.99 USD. This Matco Tools RL301 Straight Die Grinder is a powerful and efficient tool perfect for all your grinding needs. With a 1/4" collet size and 1/4" air inlet size, this die grinder is designed for easy use with a variety of automotive tools. The palm grip ensures a comfortable and secure hold, while the brand's reputation for quality ensures long-lasting performance. This single item set is ideal for anyone in need of a reliable die grinder for their automotive repairs. The manufacturer part number RL301 makes it easy to identify and choose the right tool for the job. Whether you're a professional mechanic or a DIY enthusiast, this Matco Tools RL301 Straight Die Grinder is sure to meet all your grinding needs with ease. I tested the tool with air, and it seems to be working as it should, but I'm not a mechanic, so I'm erring on the side of caution and listing as parts.