Mini Peanut Prism Replacement GMP111 GMP101 GMP111-0 mini prism Surveying total stations, Copper Coated prism. Material Of Prism : K9. Diameter Of Prism: 25.4mm(1). Angle Deviation: 5 arc sec. Coating: copper coated +black paint. Size Of Screw: M20x1 and M6x1. Brand New And High Quality NEW Mini Peanut Prism Replacement For Leica SWISS type mini prism (GMP111) Surveying the mini prism size : 25.4 mini prism copper coated Thread : one is M20X1 and another is M6X1 (see picture).