SODIAL(R) SCS20UU 20mm Linear Motion Ball Bearing Slide Bushing Product Name : Linear Motion Ball Bearing; Material : Metal, Rubber;Inner Diameter : 20mm/ 0.79" Screw Hole Dia(Each) : 5mm/ 1/5";Pitch : 40 x 40mm/ 1.6" x 1.6"(L*W) Overall Size : 50 x 54 x 41mm/ 2" x 2.1" x 1.6"(L*W*H);Main Color : Silver Tone Net Weight : 228g;Package Content : 1 x Linear Motion Ball Bearing