Standard HSS Euroboor annular cutters feature teeth geometry which is optimised for use on single layer workpieces, ensuring the fastest and best drilling performance. The rest material created with the use of these cutters is Euroboor signature: the Euroboor slug. The rim on this slug is exactly what prevents standard HSS cutters from penetrating the second layer of material.
In order to drill multiple layers of material simultaneously, Euroboor recommends the use of annular cutters with stack geometry. The unique teeth profile ensures safe and stable penetration: layer for layer.
Combined with the standard performance improving characteristics of Euroboor annular cutters this results in smooth layer transitions, precise and clean hole finishes and the time savings you are looking for.