Hole Saw, High Performance, 1-1/2 x 2-3/8-In. Brand_Laitner the cross bore should be

the cross bore should be 2-1/8-inches in diameter and the edge bore should be 1-inch in diameter

One size approved to handle up to 3' vent pipe

Features an interior locking mechanism (night lock)

No more flats

Hole Saw, High Performance, 1-1/2 x 2-3/8-In. Brand_Laitner the cross bore should beDiablo, 1 1 2" x 2 3 8", hole saw, high performance hole saws deliver faster cutting performance & increased productivity, hole saw design provides ultimate cutting depth to bore deeper holes in single pass, variable tooth design for faster cuts with less vibration & tool free plug ejection for fast material removal, snap lock offers quick & easy change system with no down time, one snap lock mandrel fits all diablo hole saws, from 5 8" to 6"