Specification Brand : BiJun BulletPoint1 : 【Unique design】:Unistrut rollers wheel it rolls smoothly, fits easily into a standard single slot, stays centered in the slot, and has good side clearance so the bolts don't rub or get stuck in the slot. BulletPoint2 : 【Trolleys Size】Strut channel trolley made of solid galvanized iron for impact resistance. The surface is galvanized to rust resistance. Unistrut trolley system steel plate hole diameter 14mm;thickness 4mm. Two trolley assemblies for use with 1-5/8" wide and all 1-5/8" or taller strut channel. BulletPoint3 : 【Bearing load】Strut channel trolley 100 pounds at 600 rpm, 200 pounds at 300 rpm, 250 pounds at 100 rpm, breaking strength: 2000 pounds. BulletPoint4 : 【MULTI-PURPOSE】2 wheel roller trolley is suitable for different situations in our daily life. Can be used in garage winch systems, electric lift systems and ceiling trolley systems. BulletPoint5 : 【Quality Service】If you have any issues with the unistrut trolley rollers then just let us know and we will solve it for you within 24 hours to ensure you are completely satisfied. Color : Golden CompatibleMaterial : Wood ExteriorFinish : galvanized IncludedComponents : 2 Wheel Trolley Assembly Roller ItemName : BiJun 2 Wheel Trolley Assembly Roller,Unistrut Rollers Two Bearing Trolley Assembly for Use with 1-5/8" Wide and All1-5/8"Ortaller Strut Channel 4pc ItemPackageDimensions_Height : 13.0048 centimeters ItemPackageDimensions_Length : 3.7084 centimeters ItemPackageDimensions_Width : 8.4074 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : beam-trolleys LoadCapacity : 200.0 pounds Manufacturer : BiJun Material : galvanized iron ModelNumber : Trolley78 MountingType : Stem Mount NumberOfItems : 1 PartNumber : Trolley78 ProductDescription : Create a unique rail system for your workroom? A door for your warehouse? Transport meat easily? Move cut wood with little effort? BiJun 2 wheel bearing trolley bring you more possibilities. Specification: Strut trolley width 1.3in/33mm, height 3.26in/83mm, thickness 0.157in/4mm. For use with 1-5/8" Wide and All 1-5/8" or Taller Strut Channel. Material: Galvanized iron Design load: 100 lbs at 600 rpm;200 lbs at 300 rpm;250 lbs at 100 rpm Break strength: 2000 lbs Suitable for: All 1-5/8" Wide and 1-5/8" or Taller Strut Channel Package included: Unistrut rollers4Pcs