Perfectly Positioned: 1-1/8'' diameter, use bolt holes recommended 3/8'' to 1.0''; 1-5/8'' diameter, suitable for 1/2'' to 1 -1/2'' bolt hole, flange thickness not exceeding 3'' Features: Knurling design of two hole alignment pins not only provides anti slip, enhances surface hardness, but also adds beautiful patterns to the metal surface Light Weight & Handy: These flange two hole alignment pins made of high quality stainless steel, stury, resistant to corrosion, oxidation and rust, greatly extending its service life. Easy to use Function: detachable threads can adapt to different lengths, you can easily install and level pipes with this double hole flange dowel set Package Included: Total 4 pack Flange Two Hole Pin: 2 × 1-1/8'' diamater flange two hole pins; 2 × 1-5/8'' diamater flange two hole pins Material: stainless steel Feature: Surface knurled treatment, beautiful appearance, anti slip and enhances surface hardness. Easy to install: 1-1/8'' diameter, use bolt holes recommended 3/8'' to 1.0''; 1-5/8'' diameter, suitable for 1/2'' to 1 -1/2'' bolt hole, flange thickness not exceeding 3''. Package Included: 2 × 1-1/8'' diamater flange two hole pins 2 × 1-5/8'' diamater flange two hole pins.