Adjustable: Unique spiral grip makes single-size restrainers obsolete. Low stress: Gentle, but secure. Mouse cannot turn or escape, natural posture maintained. Easy to use: Complete experimental access. Stable and strong: Wide base stands up to daily use, heavy construction. Easy to clean: Opens fully, will not corrode, no blind ends. Plastic and stainless steel construction. Improved technique: Save time and effort when handling laboratory rodents. User has both hands free. Relax and avoid accidents, knowing animals are gently but firmly restrained.