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These Service Caster Series #20 Polyurethane casters offer various wheel sizes and mounting heights: 3” Wheel: 4-1/8” mounting height; 3-1/2” wheel: 4-5/8” mounting height; 4” wheel: 5-1/8” mounting height; 5” wheel: 6-1/8” mounting height; 6” wheel: 7-1/8” mounting height. Wheels are offered in five different colors – Gray, Blue, Black, Maroon, and Red. Weight Capacity: 3 and 3.5 : 300 lbs Capacity/Caster; 4 , 5 , and 6 : 350 lbs Capacity/Caster All casters feature a 3/4” x 2” square stem with (3) 17/64” diameter mounting holes. Don't see the size you need? No problem! Call us or message us by clicking the blue Service Caster Corporation hyperlink underneath the buy or add to cart button and then clicking the ask a question button. Brake options include a top lock brake (TLB) or a total lock brake (TTL). The top lock brake (TLB), which is featured on 3 , 3-1/2 , 4 , and 5 wheel sizes, places a positive locking force against the wheel tread locking the wheel only. The total lock brake (TTL), which is featured on all wheel sizes, also places a positive locking force against the wheel tread, but the total lock brake (TTL) simultaneously locks the wheel and the swivel for a complete stationary position. Find other wheel materials, sizes and all Service Caster products at our Amazon Storefront. Click on the “by Service Caster” link above the main title on any Service Caster page listing. UPC 011586602847 Size 5 Wheel - 3/4 Stem Color 4 Swivel - No Brakes - Gray Rim Size 5 Inches Brand Name Service Caster Unit Count 1.0 Count Manufacturer Service Caster Material Type Polyurethane Tread on Polyolefin Core Exterior Finish Bright Zinc Plated Finish Manufacturer Part Number SCC-SQ20S514-PPUB-GRY-34-4