Structures STEELOCK Hook-in Headboard-Footboard Heavy Duty Steel Bed Frame - Metal Bed Rails - Cal King Full-length bed rails with bolt-on or hook-in connection options for headboard and footboard attachment Stronger and safer alternative to traditional bed rails Protects your headboard and footboard by eliminating the pressure on them - all weight is supported by the frame Adjustable attachment plates and adjustable height legs with glides allow for fine-tuned adjustments for use with most headboard/footboard styles Lifetime U.S. warranty protects against all defects - this is the last frame you'll ever need