THIS HEAVY-DUTY EASY-ROLLING WELL-BUILT LONG-LASTING CASTER FITS ALL SNAP-LOC® DOLLY SYSTEM PRODUCTS AND IS THE PERFECT REPLACEMENT CASTER FOR UPGRADING OTHER DOLLIES AND CARTS. THE SNAP-LOC® DOLLY SYSTEM IS THE EASIEST FASTEST AND SAFEST WAY TO MOVE MORE IN LESS TIME. FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" EASY ROLLING PRECESSION BALL-BEARING 4 INCH SOLID POLYURETHANE NON-MARKING CASTER WHEEL FOR EASIEST ROLLING OF VERY HEAVY LOADS ON HARD SURFACES AND MOST FLOORING. RIGID FIXED NO SWIVEL HEAVY DUTY BUILT TO LAST INDUSTRIAL-RATED THICK STEEL ZINC-PLATED CONSTRUCTION RESISTANT TO MOST CONTAMINANTS/WEATHER. TOUGH HARD SMOOTH WHEEL FOR SUPER-DUTY MAXIMUM CAPACITY VERSATILE SOLUTIONS SLOTTED TOP PLATE FITS INDUSTRY STANDARD 2-3/8 X 3-5/8 INCH. BOLT HOLE SLOTS 1-3/4 X 2-7/8 INCH ON CENTER. GREAT REPLACEMENT ON 4 WHEEL DOLLY CARTS PLATFORM TRUCKS PANEL CARTS SPECIFICATIONS 375 LB. CAPACITY. HEIGHT 5-1/8"" WIDTH 2-1/2 IN LENGTH 4 IN WHEEL 4 X 1-1/8 IN TOTAL WEIGHT 1.2 LBS. AUTHORIZED REPLACEMENT FOR SNAP-LOC® DOLLY