This 9-piece Rothenberger hole saw kit is ideal for most plumbing applications and is suitable for most metals, wood, and plastic. The durable bi-metal hole saws come supplied in a handy carry case. Kit includes: 19mm, 22mm, 29mm, 38mm, 44mm, 57mm hole saws, A1 Hex Arbor, and A2 Hex Arbor.