https://www.rei.com/product/150912/sterling-68-mm-hollowblock2-loop-135-in?sku=1509120001&store=81&cm_mmc=PLA_Google%7C21700000001700551_1509120001%7C92700057791493325%7CNB%7C71700000074093097&gclid=CjwKCAjw7J6EBhBDEiwA5UUM2liqwWEy8GPxYvwxGPUVxRqdgq-yTaJ-g8tdBsEHoiXIOL4XcB1knBoC8R4QAvD_BwE&gclsrc=aw.ds
Sterling 6.8 mm HollowBlock2 Loop - 13.5 in. | REI Co-op
Redesigned with a stronger aramid fiber, the Sterling 6.8 mm HollowBlock 2 loop is a friction hitch and autoblock that can be used as a prusik or Klemheist...
6 8 mmloop 13
https://www.ncbi.nlm.nih.gov/Structure/pdb/8T6T
8T6T: SpRY-Cas9:gRNA complex targeting TAC PAM DNA with 13 bp R-loop
CRISPR-associated endonuclease Cas9/Csn1NTSTSgRNA