1. Create an E-commerce Website: Develop a professional and user-friendly e-commerce website where you can showcase your products, provide detailed descriptions, images, and pricing. Ensure the website is mobile-responsive for a better user experience.

2. Optimize for SEO: Implement search engine optimization (SEO) strategies to improve your website's visibility on search engines like Google. This involves optimizing product descriptions, meta tags, and ensuring your website loads quickly.

3. Online Marketplaces: Consider listing your products on popular online marketplaces like Amazon, eBay, or Etsy, in addition to your website. This can expand your reach and tap into an existing customer base.

4. Social Media Marketing: Utilize social media platforms such as Facebook, Instagram, Twitter, and LinkedIn to promote your products. Create engaging posts, run targeted ads, and interact with your audience to build a strong online presence.

5. Content Marketing: Create valuable content related to your products, such as how-to guides, product demonstrations, and informative blog posts. Share this content on your website and social media channels to attract and educate potential customers.

6. Email Marketing: Build an email list of interested customers and send them regular updates, promotions, and product information. Email marketing can help you nurture leads and convert them into buyers.

7. Paid Advertising: Consider running paid advertising campaigns on platforms like Google Ads and social media. These ads can help you reach a larger audience quickly, especially if you have a budget for advertising.

8. Customer Reviews and Testimonials: Encourage satisfied customers to leave reviews and testimonials on your website and social media. Positive reviews can boost your credibility and attract more customers.

9. Collaborate with Influencers: Partner with influencers in your niche to promote your products. Influencers can help you reach their followers, who might be interested in your adjustable hole cutter.

10. Online Networking: Join online forums, communities, and groups related to your industry. Participate in discussions, answer questions, and subtly promote your products when relevant.

11. Customer Support: Offer excellent customer support to ensure a positive shopping experience. Respond promptly to inquiries and resolve issues effectively.

12. Analytics and Optimization: Continuously monitor your online marketing efforts using analytics tools. Adjust your strategies based on data to maximize your sales and online presence.

Remember that building a strong online presence and reaching potential customers takes time and consistent effort. By combining these strategies and adapting to changes in the online marketplace, you can increase the visibility and sales of your REMAX BRAND ADJUSTABLE HOLE CUTTER WITH PROTECTION CUP 50HS321 in the "OTHERS" category.