these bits also are widely used for the same purpose on handrails
ADVANCED TECHNOLOGIES: New innovative foam ear cup inserts and spacers help improve attenuation along with new ear cushion foam technology for an effective acoustic seal and reliable protection
one 2-wing straight cutter
Denotes double ball bearing for added stability
soft foam ear cushions and earcup tilting pivot points (position for use
Amana Tool 53600 Quadraset 1-7/8 Dia x 1/8-23/32 x 1/2 Inch Shank Sanders these bits also are widelyThe Quadraset is an adjustable slotting assembly that includes 1 8," 5 32," 3 16," & 1 4" two wing cutters, a 1 2" shank arbor with a pilot bearing, and a handful of spacers, washers and shims. Conceptually it is like a table saw dado stack set. You can use the cutters individually on the arbor, or you can combine two, three or all of the cutters on the arbor. Thus you can cut slots that range in widths from 1 8" up to 23 32" in 1 32" increments.