It’s for snap ring hardware.
54mm | Smalley WST-212-S02 | Spiral 2.125" shaft, 0.078" thk, 0.141 wall | http://www.smalley.com/ring/wst-212 |
76mm | Smalley WST-300-S02 (stainless) | Spiral 3" Shaft, .093 thick, 0.188 wall | (McMaster: 91665A630 does not fit aeropack) |
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