Ratchet Replacement Suspension for Americana Safety Helmets, Secure Fit, #19380 Secure-Fit Ratchet Replacement Suspension - Hard Hat NOT Included Fits Americana Safety Helmet Each Turn of the Ratchet Knob Automatically Locks the Adjustment with 50 Meshing Teeth Adjusts to Over 40 Different Head Sizes, 6 1/2 - 8