CRL's TAPER-LOC® 'XAL' Taper Sets for 11/16" and 27/32" (17.52 and 21.52 mm) laminated tempered glass are made up of one Setting Base/Drop-Side Taper, and one Front Side Taper. Tapers are made of high strength reinforced engineering grade polymer, and expand in thickness when compressed together with Cat. No. TLK12 Installation/Removal Tool, mechanically locking the glass panel into the Base Shoe.