Hole Enlarging adapter~ Allows nesting of one holesaw inside another for concentric enlarging of existing holes~ Double threaded to accept any size of holesawTechnical Specification:CE Certified: NoConflict Materials Content : NoREACH Content Status SVHC Free or Contains SVHC: SVHC freeRoSH Regs Within Scope: NoBatteries Included: NoBattery Powered: NoCharger Included: NoMains Powered: NoHealth and Safety Text: Users and bystanders are advised to wear safety gogglesDimensions: Length: 20mm x Height: 20mm Weight: 0.039KgWarranty: 12 months. C.K products are guaranteed for 1year against imperfect materials or workmanship. Damage caused through normal wear and tear or resulting from inappropriate use, is not covered.