Trend Router Cutter Bearing - for 1/4in shank mounting|High quality ball bearing for free running against an edge to prevent heat build up.|1/4in inside diameter for direct fit to router shanks and arbors.|3/4in outside diameter for matched fit to trimming and templating cutters.|Bearings are grease packed for maximum efficiency and lifespan.|Shielding to both sides of the bearing prevents penetration of dust for maximum performance. 
Specification:
OD=3/4 inch|OD=19.05 mm|ID=1/4 inch|ID=6.35 mm|Thick=9/32 inch|Bearing Code=R4A-ZZ
    
    
    Specification:
OD=3/4 inch|OD=19.05 mm|ID=1/4 inch|ID=6.35 mm|Thick=9/32 inch|Bearing Code=R4A-ZZ
        12 months