Prado's Forstner bits are sized for precise UniFit single-outlet installation in wood and MDF. Use the 1-3/8 in. (35 mm) bit for the main opening and the 1-1/2 in. (38 mm) bit for the optional flush-mount countersink.
For best results, use a drill press or keep a handheld drill perpendicular to the work surface and test on scrap material first.
