1001: Turbo aluminum back
1001C: Concave turbo aluminum back
1002: S turbo aluminum back
1003: Flat aluminum back
1004: Single row
1005: Double rows
1006: Turbo swirl
1007: T segmented
1008: L segmented
Diameter: 4"(100mm), 5"(125mm), 7"(175mm)
Adaptor: 7/8", M14, M16, M24*2, 5/8"-11, or special dimension
