What s the best thickness for heat shrink tubing for pigtails

A 12mm diameter 4:1 heat shrink can shrink down to 1/4 of its size (3mm diameter). That means it can be used to protect a cable between 3-12mm diameter. To choose the correct size, measure the widest part of the item you're covering, like a connector. Heat shrink tubing can be divided in three wall thicknesses: thin-wall, medium-wall and heavy-wall. Manufactured primarily from cross-linked polyolefin, PVC, fluoropolymers, or elastomeric materials, these tubes provide electrical insulation, environmental. Selecting the correct size of heat shrink tubing is critical to ensure functionality, durability, and a secure fit. For the maximum perimeter, selecting an appropriate tubing 'supplied' inner diameter with an additional 20 - 30% allowance will provide adequate space for the heat shrink tubing to fit over any anomalous protrusions.