Armored aluminum through holes are countersunk to funnel screws into position. Durable body material is highly visible, heat resistant, and has minimal flex. Chamferred edges and surface features are nice and grippy.
Ensure identical board AND screw spacing across your entire crew regardless of experience, with whatever screws you like. Reduce risk of invalidating your warranty.
Slide the BumpFin spacer between deck boards till it makes contact with the joist - then you're ready to insert screws. The through holes are at just the right spacing to offer a balance between strength and low profile asthetic. Tip the BumpFin tail up and over the joist to continue sliding into the next position. Bumpfin designs are patents pending.
The BumpFin comes to a stop when it's in position, and the viewing window proves you're centered over the joist.
You may not need a bucket of spacers and templates anymore. These slide along with your work, serve the function of both, and take up minimal room in your toolbox.