Pipe Flange Alignment Pins2121 Carbon Steel 2124 Stainless Steel(2 pc. set) - Efficient & EconomicalSpecifications • Fit-Up Pro flange pins are an economical and efficient way to align flanges. • PN 2121 for use in 5/8" - 1 7/8" holes. • Convenient push-button operation. • Items come in retail packagingFIT-UP PRO Stainless steel flange pins Fit-Up Pro stainless steel flange pin, aka “two-hole pins” are used for precise flange leveling and alignment. The PN 2124 are smaller stainless steel mini pins that fit flange holes up to 7/8". The knurled surfaces are an additional feature that allow snug flange hole fitting that increases accuracy during flange alignment. PN 2121 5/8" - 1 7/8" Flange holes 16-47 mmPN 2124 1/4" - 7/8" Flange holes 6.5-22 mmSold in pairs