#27 Couplers - Medium Underset Plastic Shank This industry leading coupler features plastic standard coupler with metal knuckle, and #634 standard centering spring and comes complete with and insulated draft gearbox and lid. The#27 Magne-Matic® Metal Coupler may be mounted with the included #213 or #232 Gearbox or with most other manufacturers cast-on coupler pockets. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. Refer to our helpful Coupler Conversion Charts to determine the appropriate coupler to use on your model. Two pair per package Package Includes: (2) Pair #27 Plastic Shank Couplers - Medium Underset Shank (2) Pair #634 Centering Spring NO.5® Style (2) Pair 055" ID & .100" ID Bushing/Sleeves (2) Pair #212 Talgo Truck Adaptors (2) Pair #213 Gearboxes (2) Pair #232 Gearboxes (2) #622 Knuckle Springs #27 Plastic Coupler Features: Material - Metal Knuckle, Plastic Coupler Shank Shank Length - Medium (9/32") (center hole to back of coupler head) Coupler Offset - Underset Knuckle Spring - #622 Centering System - Standard Shank Centering Spring - #634 Centering Spring NO.5® Style Head - Standard Head Works In Place of - #147, medium underset "clone" couplers Works With - #213, #232, #234, #242, most manufacturer cast-on draft gearboxes #212 Talgo Truck Adaptors: Material - Insulated Plastic Works With - NO.5®, #58, 20-Series and all Whisker® Couplers #213 Plastic Draft Gearboxes: Material - Insulated Plastic Dimensions - 25/64"L x 5/16"W x 3/32"H Works With - NO.5®, #58, 20-Series and all Whisker® Couplers #232 Plastic Draft Gearboxes & Lids Features: Material - Insulated Plastic Dimensions - 29/64"L x 19/64"W x 7/64"H Works With - NO.5®, #58, 20-Series and all Whisker® Couplers #27 with a #212 Talgo Truck Adaptor. Mounting Specifications: Centerline - 25/64" Trip Pin Height - 1/32" #27 in a #213 monted on bottom. Mounting Specifications: Mounting Height - 25/64" Centerline - 25/64" Trip Pin Height - 1/32" Center Hole - 2-56 Insulated Screws are the most commonly used. (Screw length will vary) #27 in a #213 monted on top. Mounting Specifications: Mounting Height - 19/64" Centerline - 25/64" Trip Pin Height - 1/32" Center Hole - 2-56 Insulated Screws are the most commonly used. (Screw length will vary) #27 in a #232 Mounting Specifications: Mounting Height - 25/64" Centerline - 25/64" Trip Pin Height - 1/32" Center Hole - 2-56 Insulated Screws are the most commonly used. (Screw length will vary) Side Holes - 0-48 Self-Tapping or 0-80 Machine Screws. (Screw length will vary) WARNING: CHOKING HAZARD - Small Parts - Not for children under 14 years. Kadee Quality Products Co. products are not toys and are not intended for children under 14 years old.