I want to affix some shelves to some cinder block walls. The shelves would be 3000 x 400mm. I have been eyeing up these brackets as supports. The shelves will be to hold power tools and toolboxes and will need to support a decent weight.
I'm completely in the dark about how to fasten the brackets to the cinder block walls. I'm eyeing up these fasteners but I feel like something that long would just be hanging loosely in the hollow cavity of the cinder blocks. Likewise I don't know if a shorter screw would support the weight involved and I don't know if the width of the screw holes in the brackets is big enough for these screws.
Normally I would just ask someone at the hardware store but quarantine means I need to pre-order and then go collect it.
Any advice would be gratefully received.