For trimming various diameter specimen for triaxial and unconfined compression tests. The lower specimen grip is mounted on a disc which rotates freely. The soil sample is mounted on the lower specimen grip and the upper grip is firmly seated on top of the specimen. The vertical guide can be adjusted to control the depth of cut. While trimming the lower disc is rotated by hand. Supplied complete with a wire saw. Trimming knife, mounted on a support, can be adjusted horizontally as well as vertically to permit trimming of the specimen to the exact size of the ring. A guide supplied prevents over cutting.