Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 37
l for boringlarge holes, and are much superior to shelltype bits in the important point of boringexactly where the hole is required. Ex-panding centre bits (Fig. 109) are known, 22 CARPENTRY AND JOINERY. and are a great convenience if of goodquality. The Forstner auger bit (Fig. 110)is guided by…
Carpentry · Joinery
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