1:1 STRAIGHT NOSE CONE – Short – Only Fits MTI E-Type Motors. MTI’s short straight nose cones fit MTI’s E-type motors. The 1:1 nose cone provides high-torque performance, excellent concentricity with low noise and maintains a chosen motor speed of up to 20,000 rpm. The twist-chuck locking mechanism is simple and safe for rapid instrument changes and accepts long-shank laboratory and other straight handpiece burs, mandrels, as well as Doriot/U-type contra angle attachments. Its ergonomic, lightweight design and 360° swivel feature provides optimal maneuverability and helps reduce hand fatigue.