Genuine GI US Military P-51 Can Opener [10 PACK], Large Size (2") Genuine GI US Military P-38 Can Opener - 1.5" Long. Dimensions: 1.5" x 5/8" (inches), tip extends .5". Genuine GI US Military P-51 Can Opener - 2" Long. Dimensions: 2" x 5/8" (inches). Military Can Openers - Small (P-38) or Big (P-51) - Take Your Pick!