18 gauge finish nails. AX style. Available in 316 stainless steel. Compatible with Spotnails: TB1840, CB1832 1 1/4", CB1850, WB1850(LM) 2"; Senco: FinishPro 15XP/18XP/25XP, 2N1, LS4, LS5, SLP20/LS1, SDN18BR; Duo-Fast: BB-4440, DBN-40525C, Pro-5, DBN-4440, DBN-4450, SureShot 4450, SureShot 4450ST; Bostitch: BT50B, BT35B, BT125SK, BT200K, T29-30, T31-1, SB-1842BN, SB-1850BN, SB-2IN1, BT1855K, BT35B; Paslode: 2138-F18, 2138-F18II, IM200-F18, T125-F18, T200-F18, 901000; Porter-Cable: BN125A, BN200A/B, BN200V12, BN138; Hitatchi: NT45A, NT32AE, NT50AD, NT50AE; Grip-Rite: GRTBN200; Dewalt: D51238, D51236K, DC608K; Makita: AF501, AF502, AF503, AF505; Max: NF211/18-25, NF211/18-50, NF221/18-55, NF255-ST/18, NF201/18-35 (PX Only); Rigid: R213BNA; Omer: 12.20, 12.40, 12.50; Fasco: F21T GN-40A, F20 PGN-31, F20 TGN-40, F25A GN-40, F26C-GN50, R3C GN-50; Campbell Hausfeld: NB0030, NB003099, NB0040.