The Pinn-ACL Guide can be used to create tibial tunnels of known lengths with a variable angle adjustment of 35 to 60 degrees with the use of a graduated pin-sleeve. Tibial guide features a patented collet locking mechanism for precise, fingertip control of pin-sleeve placement. The guides' pin-sleeves are graduated to precisely determine tunnel length prior to drilling. Femoral guides are offered in right and left versions and are designed to easily accommodate unusually large or small knees.