The sample test kit contains a variety of sample couplers and other necessary components to identify and properly install Kadee(R) couplers on locomotives and rolling stock without having to purchase full size packages of couplers, gear boxes and adaptors, springs, washers and shims that may be necessary for the coupler conversions. Kit contains HO Scale conversion list, 20 and 30 series instructions, Whisker(R) coupler instructions and sample size packages of products listed below: Couplers - Metal NO.5(R) Medium Centerset - Metal - One Pair #141 Whisker Long Underset - Metal - One Pair #142 Whisker Medium Overset - Metal - One Pair #143 Whisker Short Centerset - Metal - One Pair #144 Whisker Short Underset - Metal - One Pair #145 Whisker Short Overset - Metal - One Pair #146 Whisker Long Centerset - Metal - One Pair #147 Whisker Medium Underset - Metal - One Pair #148 Whisker Medium Centerset - Metal - One Pair #149 Whisker Long Overset - Metal - One Pair #158 Whisker Scale Medium Centerset - Metal - One Pair Couplers - Plastic 21/31 Long Underset - Plastic - One Pair 22/32 Medium Overset - Plastic - One Pair 23/33 Short Centerset - Plastic - One Pair 24/34 Short Underset - Plastic - One Pair 25/35 Short Overset - Plastic - One Pair 26/36 Long Centerset - Plastic - One Pair 27/37 Medium Underset - Plastic - One Pair 28/38 Medium Centerset - Plastic - One Pair 29/39 Long Overset - Plastic - One Pair Gear Boxes & Adaptors #212 Talgo Truck Adaptors - One Sprue Work with all couplers included in Test Kit and are standard with 20-Series couplers. #213 20-Series Gear Box with Sleeves - One Sprue Work with all couplers included in Test Kit and are standard with 20-Series couplers. #232 NO.5 Type Gear Box - One Sprue Work with all couplers included in Test Kit and are standard with #5 couplers and 20-Series couplers. #233 30-Series Gear Box - One Sprue Work with all couplers included in Test Kit Except Whisker Couplers and are standard with 30-Series couplers. #234 Short #5 Type Gear Box - One Sprue Work with all couplers included in Test Kit and are standard with short shank 20-Series and 40-Series couplers. #242 Whisker Snap-Together Gear Box - One Sprue Work with all couplers included in Test Kit and are standard with Whisker couplers. #252 Small Whisker Snap-Together Gear Box - One Sprue Work with Only Whisker Couplers. The 252 is the Whisker equivalent to the 30-Series gear box. Screws, Springs, Washers, & Shims #208 .015 Red Fiber Washer - 10 Each #209 .010 Gray Fiber Washer - 10 Each #211 .010 & .015 Shims - 10 Each #256 Plastic 2-56 x 1/2 Screws - 10 Each #621 30-Series Torsion Spring - 10 Each #622 Knuckle Springs - 10 Each NO.5 Type Centering Spring - 10 Each Uncouplers #321 Code 100 Between-The-Rails - One Pair #322 Code 83 Between-The-Rails - One Pair Tools #231 Greas-em - One Each #206 Coupler Height Gauge - One Each #241 Dual Tool - One Each