Merriway BH02848 (20 Pcs) Hammer Type Solid Wall Fixing with Nylon Plug, M8 x 100mm (5/16 inch x 4 inch) - Pack of 20 Pieces : Amazon.co.uk: DIY & Tools

They are solid concrete mounts but beware. These are advertised as hammer in fixings. I bought them to fix wooden studs into concrete wall. So idea is: you stick your wood against the wall. You drill through the wood and through the solid wall in one go (you mark the drill to the depth of the plug). You insert the plug and hammer it home. Simple? Or should be not with these. Every single time when I tried hammer them in they bent. WTF. I cursed a lot. Then I screwdriver them in instead of hammering in. Perfect! Strong good hold and straight plug. Tell me what did I do wrong in my fixing process with hammer so they bent? Maybe I just can’t do it, not sure. Either way 4/5 - would’ve been 5/5 if I actually could hammer them in easily instead of using Philips screwdriver.

The Merriway M8 x 80mm long fixing plugs are a standard size incorporating suitable screws for medium loads. The thread profile allows hammer-in but not pull-out. The thread allows for unscrewing when required.I find it is best to gently tap the plastic plug through object being fastened and wall without the screw, and then tap in the screw partway and finish off with a suitable driver.As with all these types of fixing, one needs to be aware of the strength of the materials in the wall and the loading of what is being fixed to the wall to be able to safely select suitable positioning, size and number of fixing plugs.

Used these and one snapped in the plug when hammering in. Others didnt seem tight to the wall so used a screwdriver to drive them just that bit further in but screws kept spinning. Overall they are ok for the intended use as my timber is now safely attached to the wall but I wouldn't like to put any weight on it.

Don't know how we did before these were mainstream, so much quicker than measuring a separate hole. I predrill the timber with a wood bit then hold up and use the masonry bit into the wall and obv just hammer in without moving the wood. Also useful for very heavy applications where going to use thunder bolts as these will keep it in place so you've both hands free to put additional thunder bolts in where that is required. only a few pence each so don't mind "wasting" them on that too.