Champion 36Mm (I.D.) X 3.5Mm Metric O Ring 25Pk Bulk Packs Metric Self Feeding Wood Bits regardless of application The kits regardless of application The kits contain all the necessary tools & inserts together with step by step instructions for use The Inserts are made from high grade 18 8 helically wound stainless steel wire Once installed the radial pressure of the insert holds it firmly into place Due to the exact tolerances 560 Pieces Replacement Packs Available Part # Size Pack Qty C1780 1 4mm External 50 C1780 2 5mm External 50 C1780 3 6mm External 50 C1780 4 8mm External 50 C1780 5 10mm External 50 C1780 6 12mm External 20 C1780 7 16mm External 10 C1780 8 4mm Internal 50 C1780 9 5mm Internal 50 C1780 10 6mm Internal 50 C1780 11 8mm Internal 50 C1780 12 10mm Internal 50 C1780 13 12mm Internal 20 C1780 14 16mm Internal 10 5mm Metric O Ring 25pk COR233 Champion 36mm (I