Shimano-RT56 Rotor Specification: 

Easier installation - new mounting plate construction for quick and easy installation
For resin brake pads only
Model:SM-RT56
Series: SHIMANO DEORE M6000 Series
6 bolts (P.C.D.44mm)
Size: 160mm, 180mm
Weight: 160mm 151g;180mm 164.1g

Avid-G3 Rotor Description:

Size: 160mm,180mm,203mm
Material: Martensitic mechanics stainless steel
Thickness: 1.8-1.95mm,more wear-resistant
Weight: 98g(180mm),approx
Opposite hole distance 44mm,standard size
Installation way: standard 6 hole bolts
Give 6pcs T25 standard rotor bolts.
The ventilation design is easy to clean and maintain, has the excellent heat dissipation and braking performance, it is very suitable for long-distance riding. G3 rotor is very cost effective and it is compatible with Shimano Sram Avid disc brake system.

Avid-HS1 Rotor Description:

Size: 160mm,180mm
Material: Martensitic mechanics stainless steel
Thickness: 1.8-1.9mm,more wear-resistant
Weight: 98g(160mm),approx
Opposite hole distance 44mm,standard size
Installation way: standard 6 hole bolts
Give 6pcs T25 standard rotor bolts.
The ventilation design is easy to clean and maintain, has the excellent heat dissipation and braking performance, it is very suitable for long-distance riding. rotor is very cost effective and it is compatible with Shimano Sram Avid disc brake system.

Package Includes:
1 Piece Bike Disc Rotor + 6 Pieces Bolts