UNIVERSAL FIT FOR 1.9 DIAMETER LADDERS - With dimensions of 18-20 inches in length, 5 inches in width, and 2 inches in height, our pool ladder steps are compatible with both in-ground and above-ground pool ladders featuring poles with a 1.9-inch diameter. (NOTE: Ensure compatibility by verifying the size before purchasing.) COMPLETE ACCESSORIES - Each set includes 3 pool ladders, 6 ladder bolts and 6 nuts, precisely matching the requirements for a 3-rung ladder. The bolts, with a full length of approximately 2.94 inches, feature a threaded part of 1.22 inches and a head diameter of 0.62 inches. Bolts (part number 87907) are the exact part replacement for the 87901 swimming pool ladder rung. HEAVY-DUTY MARINE-GRADE STAINLESS STEEL BOLT KIT - Made of marine-grade 304 stainless steel. Can withstand chlorides (including salt), harsh conditions, and changes in water pH. 304 stainless steel also has superior corrosion and high-temperature resistance. FITS STANDARD POOL LADDERS - Best for ladder rails that are 1.9 inches in diameter. Bolt's full length is 2.94 inches (2.875 inches excluding the head), head diameter of 0.62 inches, and a body diameter of 5/16 (0.3125) inches. BOLTS WITH UNIQUE CONCAVE HEADS - The unique curved concave heads ensure ‌the bolts will sit flush on round ladder rails with countersunk holes. The shape also allows the bolt head to match the contours of the rails. Brand Name TonGass Material Type Stainless Steel