Sequel 6063 Aluminum Spines are available in several widths and thicknesses, in Plain, Pierced or Slotted styles. The slotted Spine is also available in a titanium version. Sequel offers three Spine Hook Styles which are shown below.

14" Hooks are also available in the same widths, thicknesses and Hook Styles.

SP1
No Hook
SP2
Straight Hook
SP3
Hook with Twist