SR144K2TLZ1WN Dental Handpiece Ceramic ABEC-7 Shield & Outer Ring is combined Bearing 1/8" x 1/4" x 7/64" Outer Diameter - 2 3/16 inch (2.1875") the 30RUSS4 inner diameter is

the 30RUSS4 inner diameter is 30mm

Limiting Speed: 3200 RPM

Female Rod End PHSB8

6009 Deep groove ball bearings

SMR126C-YZZ ABEC5 Ceramic Lightning

SR144K2TLZ1WN Dental Handpiece Ceramic ABEC-7 Shield & Outer Ring is combined Bearing 1/8" x 1/4" x 7/64" Outer Diameter - 2 3/16 inch (2.1875") the 30RUSS4 inner diameter isSR144K2Z1W Dental Handpiece Stainless Steel ABEC 7 Shield and outer ring is combined Angular Contact Bearing Retainer : Torlon SR144K2Z1W Hybrid Ceramic Dental handpiece ABEC 7 Angular Contact Ball Bearing. Made of stainless steel and has Solid Si3N4 Ceramic balls. Cage is made from Torlon for lowest friction, long life and highest speed. Bearing is closed from one side by one metal Shield SR144K2Z1W Dental handpiece Ball Bearing Angular Contact ball