uxcell Window Curtain Track Rail Double Roller Glider 0.5-inch Wheel 80pcs Color: White, Black; Total Size: 33 x 20 x 13mm/1.3" x 0.8" x 0.51"(L*W*H) Material: Plastic; Net Weight: 157g Package Content: 80(+/-2%)pcs x Curtain Track Roller; Product Name: Curtain Track Roller Roller Diameter: 13mm/0.5" Hole Diameter: 6mm/0.24"