Quick-Release Spring Prevents Roller Slippage, Yet Allows Easy, One-Rap Removal. Smooth-Rolling Internal Bearings Eliminate Shank Wear And Gray Streaks. Durable, Green Fiberglass-Reinforced Nylon Cage And Endcaps. Chrome-Plated 5/16" Shank, 90-Degree Angle. Full-Size Polypropylene Grip With Reinforced Threads, Sherlock GT Compatible.