Leviton SC/APC FastCAM connectors (49991-ASC) have a fiber stub within the connector that has been cleaved at an angle of 8° (from perpendicular to the fiber). The prepared fiber that is inserted into the connector must have this same 8° cleave in order for the the inserted fiber and the existing stub to mate. Our standard Opt-X cleaver (49886-LNX) and the CTA-30 cleaver (49886-CTA) cleave with a 0° (from perpendicular) angle plus or minus their margin of error. If the standard cleavers are used the inserted fiber and the stub will have a significant gap and high loss. The Leviton APC Cleaver (49886-APC) provides the needed 8° cleave.