4U Vertical Rack. The 4 RU ProX T-4RSP Shockproof ATA Amp Rack Flight Case is a 19" gig-ready flight case with a depth of 20", dual rack rails, and Honeycomb Digital laminated 3/8" plywood for rugged protection. The case is designed for a wide variety of amplifiers, pro DJ mixers, effects, and other standard 19" rackmountable pro-audio / DJ / network gear. The flight case includes one recessed spring-action handle per side and industrial butterfly-twist latches. The rubber feet at the base ensure maximum stability when stacking multiple units. Additional features include powerful, heavy-duty steel ball corners, dual anchor rivets, and removable front and rear doors with 2.5" of clearance. Mounting hardware and padlocks are included. 4 RU front-loaded rack Professional amp rack with 20" depth, rail-to-rail Standard 19" mounting rail width Front and back removable lids Durable and solid rack rails ATA-300 style gig-ready flight road case One recessed spring-action handle per side Easy-locking fit and tongue Heavy-duty and powerful steel ball corners Industrial-strength latches and rubber feet Dual-anchor rivets 2.5" front/rear door depth Laminated 3/8" 9mm plywood Includes mounting hardware and padlocks