U-Bolt 304 Stainless Steel M8 x 50mm U-Bolt with Nuts and Flat Repair Washer Pack of 5, Silver

perfect

Hopefully, unlike the zinc-plated variety, these won't seize up with rust in two years

Well manufactured u bolts good and strong

These are good quality u-bolts but from a practical point of view insufficient nuts and washers are supplied with each bolt. Unless I have used them incorrectly, you need 4 nuts and washers per u-bolt but only 2 of each are supplied. Fortunately, I had a few on hand that I could use.