Magnesia soldering blocks are Non-asbestos, fibrous, fireproof material used as a surface for soldering. Soft enough to pin or press objects (work)
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Regal Castings Product Page - Soldering Tools & Accessories
Soft, fireproof material, into which work or pins can be easily pressed. Measures 6 long x 3 wide x 1 1/2 high.
Magnesia Soldering Block
Magnesia Soldering Block. Soft, fire-proof material, into which work or pins can be easily pressed. Measures 6 x 3 x 1.5 (15.2 x 7.6 x 3.8 cm).
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MagnesiaBlock is comparatively soft which permits steadying object into the surface or inserting pins to hold parts for soldering. Block can be easily
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