F-Clamps
https://smile.amazon.com/s?k=f+clamps&ref=nb_sb_noss
Irwin is the industry standard. I have this set (but I paid $29 not $49 as it's priced now): https://smile.amazon.com/gp/product/B07V2NFYD5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
A couple cheaper sets:
Depending on the thickness that you're clamping, you may need only 6" clamps:
I also got these chepo ones, but they're very small and weak - suitable only for more delicate work: https://smile.amazon.com/gp/product/B07WJ4G9X2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1