uxcell Plastic Window Curtain Track Carrier Wheels Rollers Glider 20pcs White Color: White; Total Size: 22 x 10mm/0.87" x 0.4"(L*D) Material: Plastic; Net Weight: 14g Package Content: 20 x Curtain Track Rollers; Product Name: Curtain Track Rollers Bolt Size: 3 x 4mm/0.12" x 0.16"(D*L) Hole Size: 5 x 7mm/0.2" x 0.28"(W*L)