1. RIDGID R0 Hole Saw Arbor — Cat. No. 53065

The RIDGID 53065 is an R0 hole saw arbor intended for smaller RIDGID M-series hole saws. It is suitable for portable drills and drill presses and features a high-speed pilot drill. The arbor permits quick hole-saw replacement without removing the arbor from the drill chuck.

2. RIDGID R4 Hole Saw Arbor — Cat. No. 59502

The RIDGID 59502 is an R4 hole saw arbor designed for larger RIDGID M-series hole saws from M76 through M152. It is the larger-capacity arbor in this pair and is intended for heavy-duty hole-saw applications using compatible drills. RIDGID identifies it as a 5/8" arbor for hole saws.