1x Bottom Roller. Roller Specifications ：. Bolt, grade 12.9, HRC45-52. Surface Hardness: HRC52-58, Deepth:5mm-10mm. So we could help you solve the problem well. Material: 50 MnB Steel. We will do our best to solve your problem as soon as possible.

1x Bottom Roller. Roller Specifications ：. Bolt, grade 12.9, HRC45-52. Surface Hardness: HRC52-58, Deepth:5mm-10mm. So we could help you solve the problem well. Material: 50 MnB Steel. We will do our best to solve your problem as soon as possible.

Roller Specifications ：. Bolt, grade 12.9, HRC45-52. Surface Hardness: HRC52-58, Deepth:5mm-10mm. So we could help you solve the problem well. Material: 50 MnB Steel. We will do our best to solve your problem as soon as possible.

Roller Specifications ：. Bolt, grade 12.9, HRC45-52. Surface Hardness: HRC52-58, Deepth:5mm-10mm. So we could help you solve the problem well. Material: 50 MnB Steel. We will do our best to solve your problem as soon as possible.