I just received the Diablo 9PC Hole Saw Kit and I am immediately impressed. I have other Diablo products that I love so I'm not surprised which is also one of the reasons I chose this kit. The pieces are housed in a sturdy plastic box with a loop with slots for each piece to keep them from rolling. inside around. Five blades with a quick release feature that eliminates the need to screw the pilot drill into the blade like older drills. I love it. The QD also holds the saw firmly in place, unlike other tools I use this slip due to the loose fit. I also like the large vents on the sides of the saws, which allow for better cooling while cutting. I used it today punching a few holes in 1/2" MDF which isn't the toughest test but it passed it fairly easily. See other users having QD issues cutting through tougher material and had trouble cutting through metal I must return to contribute to these articles.