Sliding middle size door roller,slide smoothly,quietly

JL-40BY:

1) Material: cold rolled plate

2) Surface treatment: nickel plated (color zinc)

3) Wheel material: engineering plastic-nylon

4) Bearing material: high density steel

5) Size: 7.5*1.6CM

JL-25BY:

1) Material: cold rolled plate

2) Surface treatment: nickel plated (color zinc)

3) Wheel material: engineering plastic-nylon

4) Bearing material: high density steel

5) Size: 6.2*1.0CM