Ruffian BONUS Kit Ruffian Lock-On BONUS Kit. (MTB) The leading choice for top pros across the globe. Rugged Diamondised Knurl pattern for maximum traction. Ultra Narrow racing profile for maximum control. Patented Lock-On system prevents twisting and provides rider security. BONUS KIT includes Lock-On System grips & collars in a high value SET. Black, Red, Lime, Pink, Aqua, White, Blue or Purple.