https://www.leevalley.com/en-us/shop/tools/power-tool-accessories/router-bits/110768-festool-hw-cup-hinge-bit-for-lr-32-hole-drilling-system
cup hingehole drillingfestoolhwbit
https://www.rockler.com/forstner-hinge-cup-bits
Use these Forstner bits for drilling hinge cup holes with a drill press. Standard length. Industrial bit has a larger 1/2 shank with a flat ...
forstnerhingecupbitswoodworking
https://www.leevalley.com/en-ca/shop/tools/power-tool-accessories/router-bits/110768-festool-hw-cup-hinge-bit-for-lr-32-hole-drilling-system
cup hingehole drillingfestoolhwbit