Xtreme, titanium reinforced, push-release, low (1/2”) profile suspension lock. Standard European 4-hole pattern. Converts to top-loaded use. Patented “Guide Grooves” helps patient engage plunger pin safely and accurately. 1 year warranty. Includes (2) X-SPP (Plunger Pins), (4) M6x25 and (4) M6x20TL bolts. US Pat Nos 6,361,569 and 6,689,171.