If a wheel slippage problem is something that you need to kill-off then Halos all new Butch-washers with their sharp cut teeth force multiplying design and butch non-bending heat treated 4mm thick steel bodies are the no messin about answer for you..Halo Butch Design Functions:Force multiplier design increases the force applied by 30%.(3mm grip face Vs 4.5mm nut face.)Smooth Nut face reduces tightening torque friction. Sharp cut teeth bite into any surface to provide maximum grip.Tech:4mm thick hardened Cr-Mo steel body (resists bending.) 10.2mm clearance hole (fits 3/8" and 10mm axles) 20mm outer diameter grip-face (fits into most dropouts.) Black Oxide finish (suits most applications)