For perfect layer winding of wire onto the core.
Maximum Coil O.D.: 4.0" (101.6 mm)
Minimum Coil O.D.: 1.0" (25.4 mm)
Minimum Coil I.D.: 0.500" (12.7 mm)
Maximum Coil Height: 2.0" (50.8 mm)
Wire Size: #16 – #34 AWG (1.4 – 0.16 mm)
7" Gear Head Capacity Charts