16" Tri-Lok Pad Driver w/combined NP-9200 Clutch Plate & built-in Riser. Fits Most 17" Slow Speed Floor Machines! (This Triangular Showerfeed Design Is The Most Cost Effective Option!) THIS DRIVER WILL NOT FIT MOST ADVANCE MACHINES For more information visit www.PadDrivers.com and check out the "HELPFUL FACT SHEETS".