What comes with them is just bolts and straps ... eBay sells more if that's what you want ... there is also a small 6 mm metric clamp kit that might work .... standard American bolt size would be 5/16 and regular clamp kit is 3/8 so unless you just want the step blocks and replace the hardware that will not fit ... the real question is what and how do you want to clamp ... I would think most of the time you would want low profile since z movement is limited ... it always sucks to run into a clamp ... I have used all sorts of stuff to fixture and clamp ..even bolts and fender washers ... sometimes a fixture is the hard part on cnc