Shoulder width: 0.4, 0.4, 0.5 inch (10, 11, 13 mm), needles with 0.2, 0.3, 0.4 inch (6, 7, 8, 10 mm) can securely hold all needles.
Can be firmly hammered into hard wood
All metal construction with strong stamping
150 needle loads, saving load time.