"I've used these clips on several heating and miscellaneous plumbing jobs and can't fault them. Bulk bag of 100 is good value. The clips can be clipped together for neat, even spacing of multiple parallel runs of pipework. The securing clip stops the pipe from popping out like some of the open type clips. . Useful when running long runs along a slightly curving surface. Only thing to watch with them is when trying to secure old pipework that has been painted. The clips are pretty snug fitting and you'll struggle to close the securing clip if the paint layer is substantial. Nothing a bit of scraping won't put right but requires a bit of additional effort. Screw hole is centred in the clip and is large and sufficiently recessed to avoid contact with pipe. Countersunk or mushroom head can be used but I've only ever used the former. Overall, great little pipe clips. Only wish they did them in 10mm."
"I particularly like the fact you can use a variety of screw sizes. Other clips I have used previously only allow the narrowest of screws as it fouls on the pipe. Also these clip together with 15mm version as well giving a neet Job."