Fast and accurate measurement Thread wire attachment system Set of 5 color coded holder PatentedMakes thread triangles, thread MIC's and all other current methods obsleteFits all micrometers with .245 to .312 anvils.No more lost thread wire in the chip pans.Each part fies 2 size of wiresFast and accurate measurement.Set of 5 color-coded holders, includes: .018 to .022"(purple), .024 to .032"(blue), .040 to .045"(yellow), .055 to .063"(green), .072 to .081"(red)Order No.: 600-6707