Really easy assembly, design allows for quick assembly and start drilling. The downside is it won't fit every 3/8" chuck - if available. The packaging says it fits 1/2" and 3/8" drill bits, but not my Craftsman or Ryobi 3/8" drill bits. I had to borrow a 1/2 drill bit to use this hole saw. It cuts well and quickly cuts through the chipboard I had to cut. I really see no point in buying one that is limited to 1/2" chucks.