Can I use these on 1" stock by adding an extra 1/4" bearing on it?

The shaft is not long enough to add a full 1/4" to the cut. You would also have trouble matching the second cutter to it. Yonico has a larger tongue and groove set that they are out of right now - 15222.

where are these made?

It doesn't say where its made .Only says distributed by Woodshop supplies inc Lakewood , NY

Have a variable speed router. What is the best speed for these blades?

You can get a speed rate chart from PrecisionBits. These bits are 1-7/8" diameter so they should be run between 15k-20k. Slowly dial up the RPMs on your router to the recommended maximum. Then, dial back if needed to find the "sweet spot". The sweet spot is the speed at which the least resonant vibration is present.

I have single speed router. Can I still use this set?

Use is possible, but the quality of treatment depends on the speed set by the router.

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🛠️ Seamlessly sharp, built to last—join the pros who demand precision.

ANTI POPPING DESIGN - Sturdy hardened steel body prevents bit popping, delivering consistent, professional results every time.
LIFETIME CONFIDENCE - Backed by a satisfaction guarantee and lifetime warranty—invest once, perform forever.
DURABLE CARBIDE BLADES - 3-blade micrograin tungsten carbide cutters ensure long-lasting sharpness and smooth cuts.
PRECISION SEAM CUTTING - Create flawless crossover seams in 3/4" wood with industrial-grade accuracy.
HEAT BUILD UP RESISTANCE - Teflon coating minimizes friction and heat, keeping your bits cleaner and cooler for longer runs.

The Yonico 15221 Blind Splitter Router Bit Set features industrial-quality 3-blade micrograin tungsten carbide cutters on a hardened steel body with anti-popping design. Designed for 3/4" (19mm) wood beams, it includes a 1/4" (6mm) shaft and Teflon coating for heat and build-up resistance. Perfect for flawless crossover seams in flooring, siding, and shaker doors, this set is backed by a lifetime warranty for professional-grade durability.

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