McMaster 2453T67 V Groove Wheel Track Caster, High Capacity, 4 1 2" × 4" Plate, Swivel with 6" Diameter Wheel P39 1 in Manufacturer Warranty Length 1 in Manufacturer Warranty Length Limited Lifetime Power Source Battery Includes Batteries Rechargeable NIMH Product Type Tie Down Strap Adjustment Type Ratchet Strap Width 2 in Overall Length 20 ft Fixed End Length 16 in End Type E Track End Material Steel Strap Material Polyester Color High Visibility Green Webbing Style Cut Resistant Edges Working Load Limit (WLL) 1 Mount Plate Length 4 1 2" Mount Plate Width 4" Wheel Color Gray Wheel Type Solid Wheel Tread Material Painted Iron Hardness Rating Hard Caster Type Swivel Wheel Diameter 6" Wheel Width 2" Mount Height 7 1 4" Weight Capacity per Caster 1 Clearance on 1 1 4" Track 1 2" Clearance on 1 1 2" Track 3 4" Groove Width 7 8" Bearing Type Roller Mount Material Zinc Plated Steel Temperature Range 40° F to 280° F Bearing Construction Dual Raceway Caster Swivel Construction Kingpin For Screw Size 3 8" For Surface Type Concrete