OTOTEC 10 Pack Copper Washers 33x39x2 mm Compatible with 1-1/4 UNC Core Drill Systems Thread

1-1/4 UNC copper washer compatibility: compatible with 1-1/4 UNC diamond core drill bits, extension rods, and most core drilling systems, supporting coolant fed rigs and common threaded connections. 33x39x2 mm size and fit: inner 33 mm, outer 39 mm, thickness 2 mm, seats on 1-1/4 UNC male threads; verify arbor, adapter, or spindle dimensions before purchase to ensure correct match for your setup. Diamond core drill sealing function: copper crush design compresses to create a fluid tight interface between bit and adapter, helping limit coolant loss and sustain pressure during wet core drilling tasks. Solid copper construction: smooth faces help reduce galling at contact surfaces, allows consistent deformation for sealing, serviceable when undamaged, suitable for workshop maintenance and system refreshes. Core drilling application scenarios: used for construction coring, masonry sampling, HVAC openings, plumbing pass throughs, compatible with water supplied diamond rigs, practical spares for contractors and tool rooms.