The FR-8 is designed to fit the four-notch tool fittings found on flip-flop BMX hubs with M30 x 1 threads, including models made by ACS®. Constructed from heat-treated alloy tool steel, the FR-8 features a 1" tool fitting for use with an adjustable wrench, socket, or bench vise

• Fits four-notch tool fittings with an approximate inner diameter of 25 mm and approximate outer diameter of 32 mm
• Fits freewheels on flip-flop BMX hubs with M30 x 1 threads
• Center bore for axle clearance is 10 mm
• 1" hexagonal base can be used with 1" socket or wrench