sliding door pulley,window pulley,door roller,window roller. Pulley:1,Standard bearing: 608,608z,608zz,625,625z,625zz,693,693z,693zz.2,Bearing steel material: carbon steel or bearing steel.3,We accept make the nonstandard bearing as per customer requirement,OEM with sample or drawing.4,Coating plastic material: 1, Nylon. 2,POM.4,Packing: Pallet.Drawing: Plastic wheel with bearing