This is for the optional tractors. Please see part number 53350302 for the internal tractors for the Microline 300 Turbo and 400 series. The Microline 500 series internal tractors are only available in the complete assembly (part number 50097501).
*Free Shipping: qualified products will have free shipping via our choice of ground delivery methods to most addresses in the 48 continental United States. For the "FREESHIP5" coupon promotion, qualifying orders must total $500 or more (excluding tax & shipping).
