uxcell Office Chair Roller Swivel Caster Wheel 8mm Thread 1.5Inch Dia 2pcs Main Material: Rubber, Metal; Package Content: 2 x Stem Caster Wheel Product Name: Stem Caster Wheel; Weight: 305g Features: Swivel; Main Color: Black, Silver Tone Overall Size: 60x37x85mm/2.4" x 1.5" x 3.3" (L*W*H); Wheel Size: 40mm/1.5" Thread Size: 8 x 25mm/0.3" x 1"(D*L)