Plastic triangle stairclimbing wheels designed as direct replacement casters for shopping carts, luggage carts, folding luggage carts, and sundries trolleys. The triangular wheel cluster provides stable, continuous contact with stairs for smoother, safer movement without tilting or breakage. Key benefits Stable triangle structure: threewheel cluster rotates smoothly over stair edges to prevent tilting and reduce jolts. Durable material: molded from hard, thick plastic to withstand heavy loads and regular use. Improved traction and wear resistance: design and material give stronger grip and longer service life compared with standard singlewheel casters. Easy replacement: fits common shopping cart, luggage cart, folding luggage cart, and utility trolley applications where stairclimbing casters are required. Reliable performance: supports repeated stair transitions and heavy items for more consistent operation. Features and specifications Function: stairclimbing and rolling on uneven steps and curbs. Construction: triangle cluster of plastic wheels for continuous stair contact and load distribution. Material: hard, thick plastic for strength and wear resistance. Compatibility: replacement part for shopping carts, luggage carts, folding luggage carts, sundries trolleys, and similar wheeled equipment that accept this style of caster. Performance: designed to roll smoothly without breaking or tilting while carrying heavy objects. Typical use scenarios Carrying luggage up and down stairs at transit hubs or multilevel buildings using a folding luggage cart. Moving groceries or shopping bags over steps and curbs with a shopping trolley during deliveries. Transporting boxes, tools, or supplies on a sundries trolley for short deliveries where stairs are encountered. Installation notes existing stairclimbing casters with the triangle wheel assembly according to the trolley or cart mounting style. Confirm mounting size and bolt or axle type match the receiving hardware before installation. This replacement caster set offers a practical upgrade for carts that frequently encounter stairs, curbs, or uneven surfaces, improving stability and extending service life without changing the cart structure.