THIS ITEM IS COMPATIBLE WITH UMBRELLA HOLES HAVING A DIAMETER OF 2.17 INCHES. 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 UMBRELLAS. 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, DESIGNED TO RESIST BREAKAGE AND RUST. SUITABLE FOR USE IN VARIOUS OUTDOOR SETTINGS INCLUDING BEACHES, BACKYARDS, BALCONIES, AND POOLSIDES. SELECT THE APPROPRIATE COMBINATION TO SECURELY FIT YOUR UMBRELLA POLE, REDUCE WIND-INDUCED SHAKING, AND HELP PREVENT SCRATCHES OR DENTS CAUSED BY FRICTION. EASY TO INSTALL: CHOOSE THE APPROPRIATE SIZE UMBRELLA HOLE RINGS BASED ON YOUR UMBRELLA POLE DIAMETER. INSERT AND FIT THEM SECURELY TO STABILIZE THE UMBRELLA. AFTER INSTALLATION, TIGHTEN THE M8 40 MM THREADED SCREW AND ADJUST THE KNOB TO HELP PREVENT SLIPPING. MATERIAL: PLASTIC COLOR: BLACK PACKAGE CONTENTS: 2 SETS X RING PLUG COVER (BASE NOT INCLUDED) THIS LISTING INCLUDES ONLY THE ITEMS MENTIONED ABOVE. OTHER ACCESSORIES OR DECORATIONS SHOWN ARE NOT INCLUDED. NOTE: DUE TO LIGHTING AND MONITOR DISPLAY DIFFERENCES, THE ITEM COLOR MAY VARY SLIGHTLY FROM THE IMAGES. ALLOWED MEASUREMENT TOLERANCE IS +/- 13 CM.