Jacks

Bronze Squareback Cup Jacks

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Bronze cup jacks on a Jim Moore-style squareback handle, which holds the blades more parallel when open. Good for opening thin, straight-sided cylinders and cones.

Furnace / hot shop

Blades: Bronze
Handle: Squareback

Where to buy

Ennion Glass Tools Direct from the maker
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Links last checked September 30, 2026.

About this tool

Bronze is softer than steel and chills the glass less, so you get smoother tooling, more working time, and fewer chill marks. It won’t rust, but it’s for hot glass only: don’t force it on cold or very thick glass. Works best with carnauba wax.