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Using the same quality standards as our regular steel bearings, these ultra-glide bearing assemblies feature satin-smooth Delrin sleeves. Delrin is an industrial synthetic plastic material similar to nylon, and will leave no marks on the material being cut. Applications include solid-surface materials such as Gibraltar, Corian, Surell & Fountainhead. Etc.; Plexiglas & other clear acrylics; and plastic laminates. Not recommended for regular wood applications Due to a higher wear factor., #47727, diameter (D) 1.382 (1-3/8), application slot Cutter assemblies: 1/4" Depth of cut; & 53610, D 5/16, 47727 ultra-glide high performance ball bearing 1-3/8 Overall DIA x 5/16 inner DIA