Canadian Threadall We bend most configurations including U-bolts, J-bolts and L-bolts - from 1/16" to 4" diameter. In addition to threading and bending we also produce concrete forming hardware, taper ties, … We bend most configurations including U-bolts, J-bolts and L-bolts - from 1/16" to 4" diameter. In addition to threading and bending we also produce concrete forming hardware, taper ties, …