Standard Pack = 1 piece(s). Minimum Opening (Ctr. To Ctr.) = 11/32 ; Maximum Opening (Ctr. To Ctr.) = 1-17/32 ; Tips Included = PL-529A(2), PL-529B(2), PL-529C(2), PL-529D(2), PL-530A(2), PL-530B(2), PL-530C(2), PL-530D(2) ;