A 16 piece hole saw kit.
Sizes include: 19mm, 22mm, 29mm, 32mm, 38mm, 44mm, 54mm, 64mm, 76mm, 89mm, 102mm, 127mm
Metal, grey
Video-How to use: https://youtu.be/TPBVJ06204w
Article-How to use: https://www.familyhandyman.com/project/how-to-properly-use-a-hole-saw/