What is a BBS?Find out the cutting length for a 300*300 column with 40 mm cover?

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What is a BBS?Find out the cutting length for a 300*300 column with 40 mm cover?..

for ring
first of all which dia u used
Suppose ur dia is 8mm
4*260+20*d-10*d (10*d =2d*no.of bends|5|)
(each bend deduct 2d)
So cutting lenth is =1120mm

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