I love the Steelex casters, so I figured I'd give these a try. Wow, these are poor quality. The screw is almost useless and the countersink is nigh near impossible to prevent from slipping on the shaft. I do not recommend these Countersinks. I gave them 2 stars because you get a wooden box to keep them in and I really like the Steelex Casters.Steelex D2610 4-Inch 275-Pound Swivel Double Lock Polyurethane Plate Caster