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  • It being plastic means it will deform and slip off before you can apply any massively damaging torque, even if it is in a metal BB spanner (try taking off a particularly seize BB with one of those plastic adaptors). Not that it will allow to set a specific torque. Same as when the preload crank cap tool is made of plastic too.

  • I think it's plastic for cost/manufacture reasons. Shimano BBs can be tightened to up to 50 Nm. Which is a lot. Crank cap only up to 1.5 Nm, which is why the tool only has finger grips and is made out of much softer plastic

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