Highly robust belay carabiner with the proven steel insert from Edelrid's Bulletproof series. The integrated spring bar reliably prevents the carabiner from twisting in the tie-in loop so as to eliminate the risk of cross loading. In addition, the bar can only be opened if pressed from above, preventing the tie-in loop from accidentally changing position. Thanks to the compact design and slide gate closure, however, the HMS Bulletproof Belay Carabiner still has a slender profile and can be operated one-handed.