Precision-made, with set screw to hold blade firmly. Hexagonal swivel heads prevent rolling and each handle is color banded for size identification. Lengths are proportioned to blade size and range from 4 1/8" to 3 1/4" (105 to 83 mm). Sets contain all nine blade sizes, 3.00 mm to .60 mm (.118" to .023"). Swivel stand has compartments for separate blades in the center.