Cam Jam XT, Heavy Duty Rope Tightener Tool, Designed To Tighten, Tension & Securely Lock Serious Loads Up To 280 LB, Carabineer Clip & Gate On 1 End & Rotating Cam Mechanism On The Other Allows You To Anchor The Carabineer & Feed The Cord Through The Cam Until You've Reached The Desired Level Of Tension, Bundle Or Wrap Heavy Loads & Easily Secure, Pull The Cord Firmly & The Cam Locks Into Place & Stays That Way Until You Release It By Rotating The Cam & Pulling Up On The Cord, Easy To Adjust & Re-Adjust, Engineered For Superior Durability & Strength & Can Be Used & Reused, Excellent For Securely Tying Down Lumber, Gear & Other Heavy Loads To Roof Racks, Bike Racks, & Truck Beds, Designed To Hold The Cord Without Tension In A Slack Configuration Allowing For Greater Versatility Of Use.