These are drill collars (aka stops, bushings) to set up for specific repeatable hole depths.
Includes all 1/64 increment sizes between 3/32 and 1⁄2. These are embossed with sizes.

These are setup for a single pan head type sheet metal screw, these are just the widely available flat head screws marketed as “sheet metal” screws with slightly more threads than a wood screw. For sizes up to 1⁄4" use a single #6-5/8" screw, above 1⁄4" use a #8 x 3/4" screw. DO NOT use with screws longer than 3⁄4", the protruding point will extend out and could rip open your hand or snag loose items.

I have also designed a tray to hold the entire set in your toolbox or drawer. It has a cutout for a stubby Phillips screwdriver to tighten the stop collar on your bit. *Note tray dimensions (190mm x 210mm) and compare them to your printer build plate size.

You can download individual sizes as needed or the entire set is available as well in a zip file.