NTN Deep Groove Ball Bearings 6028, D=140 T Handle Star Key Set (12pt for 17 19 TCT Long Hole Saw with Step Center Drill (12pt for 17 19 21 mm) Product Specifications Bit size: 6 ◦ Grip hole for falling prevention strap installation Torque Small Small Higher Medium Dust proofing Good Better than ZZ type Excellent Much better than LLB type Water proofing Poor Poor Very good Good High speed capacity Same as open type Same as open type Limited by contact seals Much better than LLU type Allowable temp 2992 in Closure Type Open Row Type & Fill Slot Single Row Non Fill Slot Snap Ring Included Without Snap Ring Internal Clearance CN Operating Temperature Range 40 to 250 ºF Cage Type Pressed Dynamic Load Capacity 27420 lbf Static Load Capacity 24500 lbf Precision Rating Class 0 Seal Type None Finish Coating Uncoated Bearing Material High Carbon Chrome Steel Cage Material Steel Inner Ring Width 33