This is matching pair of scales which will fit onto the sides of any 58mm model Swiss Army Knife with removable plastic sides, including the popular Classic SD. The scales pictured in the example photo are in Black Detail plastic on a Classic SD model SAK.
These are solid scales without slots for the tweezer or toothpick accessories. I have designed them to fit fully and snugly, so depending on the tolerances of the material you order them in, you may need to wrap the knife in a towel and carefully tap them on with a solid object until the scales are fully seated on the knife. Once attached to your knife I do not recommend removing the scales as the attachment holes may become damaged.