These spring loaded drill bit guides are self centring and are used for accurate drilling of holes for fittings such as hinges to ensure exact alignment. They can be easily dismantled for cleaning and are supplied with a HSS Drill Bit. Drill Size.3.5 metre (9/64in). Screw Size. No.10 https://elecena.pl/product/27169496/trend-snap-dbg-9-centring-guide-9-64in-drill 2024-11-07 https://elecena.pl/product/27169496/trend-snap-dbg-9-centring-guide-9-64in-drill 2025-03-18