THIS ITEM IS COMPATIBLE WITH UMBRELLA HOLES HAVING A DIAMETER OF 2.17 INCHES ONLY. PLEASE VERIFY THE SIZE BEFORE PURCHASING. PACKAGE INCLUDES: 2 SETS OF OUTDOOR PATIO UMBRELLA BASE STAND REPLACEMENT PARTS. EACH SET INCLUDES ONE 1.5 INCH AND ONE 1.9 INCH UMBRELLA HOLE RING, AND ONE 40 MM LONG M8 THREADED SCREW. MULTIPLE COMBINATION OPTIONS HELP MEET VARIOUS UMBRELLA POLE DIAMETER REQUIREMENTS. IDEAL FOR STABILIZING AND ALIGNING PATIO UMBRELLA BASES. MADE OF HDPE PLASTIC, THESE REPLACEMENT PARTS ARE DURABLE, REUSABLE, AND RESISTANT TO HIGH TEMPERATURES AND WEATHER CONDITIONS. THE THREADed KNOB IS CONSTRUCTED FROM BLACK PLASTIC AND STAINLESS STEEL, PROVIDING RELIABLE PERFORMANCE WITHOUT EASILY BREAKING OR RUSTING. SUITABLE FOR USE IN VARIOUS OUTDOOR SETTINGS INCLUDING BEACHES, BACKYARDS, BALCONIES, AND POOLSIDE AREAS. SELECT THE APPROPRIATE COMBINATION TO SECURELY FIT YOUR UMBRELLA POLE, REDUCE WIND-INDUCED SHAKING, AND PREVENT SCRATCHES OR DENTS CAUSED BY FRICTION. EASY TO INSTALL: CHOOSE THE APPROPRIATE SIZED UMBRELLA HOLE RINGS BASED ON YOUR UMBRELLA POLE DIAMETER. INSERT AND FIT THEM TIGHTLY TO STABILIZE THE UMBRELLA. AFTER INSTALLATION, TIGHTEN THE M8 40 MM THREAD AND ADJUST THE KNOB TO PREVENT SLIPPING. MATERIAL: PLASTIC COLOR: BLACK PACKAGE CONTENTS: 2 SETS x RING PLUG COVER (BASE NOT INCLUDED) THE DELIVERY INCLUDES ONLY THE ITEMS LISTED ABOVE. OTHER ACCESSORIES SHOWN ARE NOT INCLUDED. NOTE: DUE TO LIGHTING AND MONITOR DIFFERENCES, THE COLOR MAY VARY SLIGHTLY FROM THE IMAGE. ALLOWED MEASUREMENT TOLERANCE IS +/- 1-3 CM.